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CHARLES H. F. THI-EME, OF NORTH VlilRNOll', INDIANA.

Letters Patent No. 81,036, dated August 11, 1868.

IMPROVED PRIMING FOB. NEEDLE-GUNS.

(the fi'rlgrhule refcmt to in flgese Enters fintent ant mating part at the same.

TO ALL WHOM IT MAY CONCERN:

Be it known'that I, CHARLES H. F. THIEME, of North Vernon, i the county of Jennings, and State of Indiana, have invented a new and useful Priming for Needle-Guns; and I do hereby declare the following to be a full and exact description thcreof,'suflicient to enable others skilled in the art to which my invention appertains to fully understand and use the same. a

This composition is intended to subserve the purpose of the fulminate, which, by the penetration of the pointed instrument, is made to ignite the charge in the needle-gun. Sulphur, cyanide or fulminate ofmercury is commonly used as the base of such compositions, but these ingredients are objectionable by reason of the fact that they ar a liable to accidental ignition from concussion, and become deteriorated, if no toellv destroyed, by evaporative action to whichthey are subject.

I substitute, fo heimperfect bases heretofore employed, the hyposulphite of any metal. In other respects, my ingredients and mode of preparation are not difi'erent from such as are comm-only employed and practised. The hyposulphite crystallizes in about three weeks after the composition has been made. The composition \yill then invariably explode when penetrated, will preserve its good quality, and maybe subjected to concussion without igniting, thus obviating many dangerous explosions which result from the 'use of such compositions as heretofore prepared. V I v In preparing the priming according to my invention, I take one part of hyposulphite of silver, lead, or other metal; four parts of sulphurettecl antimony; ten parts of ch oride of p tash; three parts of sulphur; one-fourth part of white sugar.

I do not confine myself strictly to the above proportions. The ingredients are either mixed together and dampened, or mixed in water, after which the composition is ready for u Having thus described my invention, what I claim as new, and desire to secure by Letters Patent, -1s'- ln explosive or igniting-composition, having hyposulphite of any metal as a base, substantially as set forth.

. I CHARLES H. F. THIEME.

Witnesses:

Cass. D. 8mm, JACOB F. HENRY. 

